VIPER06XN

Manufacturer Part NumberVIPER06XN
DescriptionAC/DC Switching Converters VIPer 800V Plus Fixed Freq 30kHz
ManufacturerSTMicroelectronics
TypePWM Low-Standby High Performance Controller
VIPER06XN datasheet
 


Specifications of VIPER06XN

RohsyesOutput Voltage800 V
Input / Supply Voltage (max)23.5 VInput / Supply Voltage (min)11.5 V
Switching Frequency30 kHzSupply Current1.3 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleThrough Hole
Package / CaseDIP-7Maximum Operating Temperature+ 125 C
Minimum Operating Temperature- 25 CNumber Of Outputs1
Output Power30 mWFactory Pack Quantity50
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Oscillator
9
Oscillator
The switching frequency is internally fixed at 30 kHz or 60 kHz or 115 kHz (respectively part
numbers VIPER06Xx, VIPER06Lx and VIPER06Hx).
The switching frequency is modulated by approximately ±3 kHz (30 kHz version) or ±4 kHz
(60 kHz version) or ±8 kHz (115 kHz version) at 230 Hz (typical) rate, so that the resulting
spread spectrum action distributes the energy of each harmonic of the switching frequency
over a number of sideband harmonics having the same energy on the whole, but smaller
amplitudes.
10
Soft startup
During the converter’s startup phase, the soft-start function progressively increases the
cycle-by-cycle drain current limit, up to the default value I
further limited and the output voltage is progressively increased, reducing the stress on the
secondary diode. The soft-start time is internally fixed to t
in
Table 7 on page
after a fault event.
This function helps prevent saturation of the transformer during startup and short-circuit.
11
Adjustable current limit set point
The VIPER06 includes a current-mode PWM controller. The drain current is sensed cycle-
by-cycle through the integrated resistor R
inverting input of the PWM comparator, see
voltage is equal to the voltage derived from the COMP pin, the power MOSFET is switched
OFF.
In parallel with the PWM operations, the comparator OCP, see
the level of the drain current and switches OFF the power MOSFET in case the current is
higher than the threshold I
The level of the drain current limit I
between the LIM and GND pins. Current is sunk from the LIM pin through the resistor R
and the setup of I
R
is shown in
LIM
When the LIM pin is left open or if R
fixed to its default value, I
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8, and the function is activated for any attempt of converter startup and
SENSE
Figure 2 on page
, see
Table 7 on page
Dlim
can be reduced using a resistor R
Dlim
depends on the level of this current. The relation between I
Dlim
Figure 13 on page
11.
has a high value (i.e. > 80 kΩ), the current limit is
LIM
, as given in
Table 7 on page
Dlim
Doc ID 022794 Rev 1
. In this way the drain current is
Dlim
, see typical value
SS
and the voltage is applied to the non-
4. As soon as the sensed
Figure 2 on page
8.
connected
LIM
8.
VIPER06
4, checks
LIM
and
Dlim